Question
A windshield wiper on a certain model car pivots through an angle of 123°. The total arm and blade length is 24 inches. If the blade is 21 inches, what is the total area of windshield being cleaned by the wiper?
Answers
Steve
area of a sector is
a = 1/2 r^2 θ
so, the area is
1/2 π(123/180) (24^2-3^2) = 608.6 in^2
a = 1/2 r^2 θ
so, the area is
1/2 π(123/180) (24^2-3^2) = 608.6 in^2